{"id":"9114eb17-dd55-44bc-815a-a7ae6ef56e73","shortId":"TRUqS5","kind":"mpp","title":"Add email allow/block list entries for AI agent inboxes via MPP-paid API calls.","tagline":"Add email allow/block list entries for AI agent inboxes via MPP-paid API calls.","description":"This endpoint is part of the AgentMail MPP gateway, which provides programmatic email inbox management for AI agents. The specific route `POST /v0/lists/{direction}/{type}` creates a new list entry at the organization level, allowing you to add email addresses or domains to allow or block lists for send, receive, or reply directions. A parallel endpoint exists scoped to individual inboxes and pods.\n\nThe API uses MPP (Micropayment Protocol) with Tempo settlement on chain ID 4217. Creating a list entry costs a fixed price of $0.01 per call (the x-payment-info shows price \"0.010000\"). Read operations (GET, list entries) are priced at $0.00. The request body requires an `entry` field (email address or domain) and an optional `reason` string. Path parameters `direction` (send, receive, reply) and `type` (allow, block) determine which list the entry is added to. Bearer authentication is required via the Authorization header.\n\nAgentMail is a YC-backed company that raised $6M in seed funding. The broader API surface covers inbox creation, message sending/receiving, threads, drafts, attachments, webhooks, custom domains, pods, and metrics — all accessible through the same MPP gateway at mpp.api.agentmail.to.","tags":["email","inboxes","domains","drafts","threads","webhooks","messaging"],"capabilities":["email-list-management","allow-list","block-list","inbox-filtering","mpp-payment","tempo-settlement","bearer-auth","organization-scope","inbox-scope","pod-scope"],"categories":["email","agent-infra"],"synonyms":["email allowlist","email blocklist","sender whitelist","sender blacklist","email filter rules","agentmail lists","inbox allow block","email access control"],"warnings":["No dedicated documentation pages served from the MPP gateway (docs/api/pricing all return 404)","Response example is inferred from the OpenAPI ListEntry schema, not from a live 200 response","Currency address 0x20C0...8b50 on chain 4217 (Tempo) — exact token not independently verified but consistent with pathUSD (6 decimals)"],"endpointUrl":"https://mpp.api.agentmail.to/v0/lists/:direction/:type","protocol":"mpp","transport":"http","auth":{"type":"mpp","details":{"realm":"mpp.api.agentmail.to","intent":"charge","method":"tempo","service_methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}}}},"qualityScore":"0.820","qualityRationale":"Full OpenAPI 3.1 schema with detailed component definitions, live 402 MPP challenge captured, clear pricing in x-payment-info. Docs pages on the MPP gateway itself return 404, but the OpenAPI spec is comprehensive. Response examples are inferred from schema rather than captured 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'0.00':135 '0.01':116 '0.010000':126 '4217':106 '6m':187 'access':210 'ad':168 'add':1,16,68 'address':70,144 'agent':8,23,48 'agentmail':37,178 'agentmail lists' 'ai':7,22,47 'allow':65,74,160 'allow-list' 'allow/block':3,18 'api':14,29,95,193 'attach':202 'authent':171 'author':176 'back':183 'bearer':170 'bearer-auth' 'block':76,161 'block-list' 'bodi':138 'broader':192 'call':15,30,118 'chain':104 'compani':184 'cost':111 'cover':195 'creat':56,107 'creation':197 'custom':204 'determin':162 'direct':54,83,154 'domain':72,146,205 'draft':201 'email':2,17,43,69,143 'email access control' 'email allowlist' 'email blocklist' 'email filter rules' 'email-list-management' 'endpoint':32,86 'entri':5,20,60,110,131,141,166 'exist':87 'field':142 'fix':113 'fund':190 'gateway':39,215 'get':129 'header':177 'id':105 'inbox':9,24,44,91,196 'inbox allow block' 'inbox-filtering' 'inbox-scope' 'individu':90 'info':123 'level':64 'list':4,19,59,77,109,130,164 'manag':45 'messag':198 'metric':208 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'yc-back':181","prices":[{"id":"37e352ab-29f8-4e64-89b5-a745e24ed1a2","listingId":"9114eb17-dd55-44bc-815a-a7ae6ef56e73","amountUsd":"0.01","unit":"per_call","nativeCurrency":"pathUSD","nativeAmount":"10000","chain":"tempo","payTo":null,"paymentMethod":"mpp-tempo","isPrimary":true,"details":{"realm":"mpp.api.agentmail.to","intent":"charge","method":"tempo","dynamic":false,"decimals":6,"unit_type":null,"amount_hint":null,"raw_payment":{"amount":"10000","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"description":"Create list entry"},"asset_contract":"0x20c000000000000000000000b9537d11c60e8b50"},"createdAt":"2026-04-18T19:58:53.536Z"}],"sources":[{"listingId":"9114eb17-dd55-44bc-815a-a7ae6ef56e73","source":"mpp_dev","sourceId":"agentmail:POST:/v0/lists/:direction/:type","sourceUrl":"https://mpp.dev/api/services","isPrimary":true,"firstSeenAt":"2026-04-18T19:58:53.536Z","lastSeenAt":"2026-04-22T02:45:04.314Z"}],"details":{"listingId":"9114eb17-dd55-44bc-815a-a7ae6ef56e73","quickStartSnippet":"curl -X POST 'https://mpp.api.agentmail.to/v0/lists/receive/block' \\\n  -H 'Authorization: Bearer <MPP_TOKEN>' \\\n  -H 'Content-Type: application/json' \\\n  -d '{\"entry\": \"spam@example.com\", \"reason\": \"Known spam sender\"}'","exampleRequest":{"entry":"spam@example.com","reason":"Known spam sender"},"exampleResponse":{"entry":"spam@example.com","direction":"receive","list_type":"block","created_at":"2025-01-15T12:00:00Z","entry_type":"email","organization_id":"org_abc123"},"schema":{"path":"/v0/lists/:direction/:type","method":"POST","payment":{"amount":"10000","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"description":"Create list entry"},"description":"Create list entry"},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"AgentMail raised $6M in Seed Funding","source_url":"https://mpp.api.agentmail.to"},{"claim":"Create List Entry endpoint has fixed price of 0.010000 via MPP","source_url":"https://mpp.api.agentmail.to"},{"claim":"Direction enum values are send, receive, reply; ListType enum values are allow, block","source_url":"https://mpp.api.agentmail.to"},{"claim":"MPP challenge uses method tempo with chainId 4217 and intent charge","source_url":"https://mpp.api.agentmail.to"},{"claim":"CreateListEntryRequest requires entry (string) and optional reason (string)","source_url":"https://mpp.api.agentmail.to"},{"claim":"ListEntry response includes entry, organization_id, direction, list_type, entry_type, created_at","source_url":"https://mpp.api.agentmail.to"}],"useCases":["Block spam domains from reaching an AI agent's inbox","Allow only specific sender addresses for a customer-support agent","Restrict outbound sends to approved recipient domains","Manage per-inbox or organization-wide email filtering rules","Programmatically update block lists in response to detected abuse"],"bestFor":["AI agents that need programmatic email filtering","Automated inbox management workflows","Multi-tenant agent platforms needing per-pod or per-inbox list control"],"notFor":["Human-facing email client features (no UI)","Bulk email marketing or newsletter management","Non-email communication channels"],"kindDetails":{"docs":{"homepage":"https://docs.agentmail.to"},"tags":["email","inboxes","domains","drafts","threads","webhooks","messaging"],"realm":"mpp.api.agentmail.to","status":"active","methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}},"provider":{"url":"https://agentmail.to","name":"AgentMail"},"categories":["ai","social"],"service_id":"agentmail","integration":"first-party","service_name":"AgentMail","service_description":"Email inboxes for AI agents."},"updatedAt":"2026-04-22T02:45:04.314Z"}}